found: Risley, J.C. Upper Klamath Lake Basin nutrient-loading study ... 1999:p. 1 (Upper Klamath Lake) p. 3, map (Oregon)
found: GNIS, OR(Upper Klamath Lake; lake; Klamath Co.; 42⁰23ʹ54ʺN, 121⁰52ʹ53ʺW)
found: Lippincott(Upper Klamath Lake, natural large freshwater lake, Klamath Co., S. Oregon, extends N. from city of Klamath Falls; 20 mi./32 km. long., 8 mi./12.9 km. wide)
found: Rand McNally.
found: Web. geog.(Klamath Lakes; two lakes formerly connected, Upper Klamath Lake in S.W. Klamath Co., S. Oregon, and Lower Klamath Lake, extending into Siskiyou Co., N. California; ref. from Upper Klamath Lake)
found: GNISlake; 42°23ʹ54ʺN 121°52ʹ53ʺW